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Take ANSI and tree characters into account

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This commit is contained in:
Jeremy Kolb 2024-08-12 14:49:52 -04:00
parent abbaba9122
commit d49e14ba4a
1 changed files with 51 additions and 15 deletions
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68
src/nix/flake.cc
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@ -1263,6 +1263,46 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
attrPath.size() >= 1 && attrPathS[0] == "hydraJobs" ? "derivation" :
"package";
if (description && !description->empty()) {
// Takes a string and returns the # of characters displayed
auto columnLengthOfString = [](std::string_view s) -> unsigned int {
unsigned int columnCount = 0;
for (auto i = s.begin(); i < s.end();) {
// Test first character to determine if it is one of
// treeConn, treeLast, treeLine
if (*i == -30) {
i += 3;
++columnCount;
}
// Escape sequences
// https://en.wikipedia.org/wiki/ANSI_escape_code
else if (*i == '\e') {
// Eat '['
if (*(++i) == '[') {
++i;
// Eat parameter bytes
while(*i >= 0x30 && *i <= 0x3f) ++i;
// Eat intermediate bytes
while(*i >= 0x20 && *i <= 0x2f) ++i;
// Eat final byte
if(*i >= 0x40 && *i <= 0x73) ++i;
}
else {
// Eat Fe Escape sequence
if (*i >= 0x40 && *i <= 0x5f) ++i;
}
}
else {
++i;
++columnCount;
}
}
return columnCount;
};
// Maximum length to print
size_t maxLength = getWindowSize().second > 0 ? getWindowSize().second : 80;
@ -1271,29 +1311,25 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
auto newLinePos = trimmed.find('\n');
auto length = newLinePos != std::string::npos ? newLinePos : trimmed.length();
// Sanitize the description and calculate the two parts of the line
// In order to get the length of the printable characters we need to
// filter out escape sequences.
auto beginningOfLine = fmt("%s: %s '%s'", headerPrefix, type, name);
auto beginningOfLineLength = filterANSIEscapes(beginningOfLine, true).length();
auto restOfLine = fmt(" - '%s'", filterANSIEscapes(trimmed, false, length));
auto line = fmt("%s: %s '%s' - '%s'", headerPrefix, type, name, trimmed.substr(0, length));
// If we are already over the maximum length then do not trim
// and don't print the description (preserves existing behavior)
if (beginningOfLineLength >= maxLength) {
if (columnLengthOfString(beginningOfLine) >= maxLength) {
logger->cout("%s", beginningOfLine);
}
else {
auto line = beginningOfLine + restOfLine;
// FIXME: Specifying `true` here gives the correct length
// BUT removes colors/bold so something is not quite right here.
line = filterANSIEscapes(line, true, maxLength);
// NOTE: This test might be incorrect since I get things like:
// 168 or 161 > maxLength.
if (line.length() > maxLength) {
line = line.replace(line.length() - 3, 3, "...");
// If the entire line fits then print that
else if (columnLengthOfString(line) < maxLength) {
logger->cout("%s", line);
}
// Otherwise we need to truncate
else {
auto lineLength = columnLengthOfString(line);
auto chopOff = lineLength - maxLength;
line.resize(line.length() - chopOff);
line = line.replace(line.length() - 3, 3, "...");
logger->cout("%s", line);
}
}